Artificial leg.



PATENTED DEU. 8, 1903.

J. JOHNSTON. ARTIFICIAL LEG.

APPLIOATION FILED JULY 2, 1903.

N0 MODEL.

A l l 1 l l l l l PatentedDecemberS, 1903.

'PATENT OFFICE.

JAMES .IOHNSTON OF JAMAICA PLAIN, MASSACHUSETTS.

ARTIFICIAI. LEG.

SPECIFICATION forming part of Letters Patent No. 746,336, datedDecember8, 19.03@

Application ined July ze, 1903.

To @ZZ whom t may concern.:

Be it known that I, JAMES JOHNSTON, a subject of the King of England,residing at Jamaica Plain,in the county'of Suffolk and StateofMassachusetts,have invented new and useful Improvements in ArtificialLegs, of which the following is a specification.

This vinvention relates to an kimprovement `in artificial legs, theobject of the invention being to provide means for compensating for thewear or stretching of the elastic `bands which connect one legfsectionto a slip-socket, and Vthus make sure that there is no play between thesocket and the stump of the leg.

The invention consists,mainly,in an adjustable plate consisting of twopieces, onefast to the socket, the other fastened to an elastic band,which in turn is fastened to a leg-section, the two parts of `said platebeing adjustable with relation to each other, so that the length of theplate may be increased or diminished, as may be desired.

The invention further consists in the combination and arrangement ofparts set forth in the following specification and particularly pointedout in the claims thereof.

Referring to the drawings, Figure 1 is a perspective view of anartiiicial leg constructed in accordancev with my invention.- Fig. 2 isan enlarged side elevation of a portion of the lower leg-section. l Fig.3 is aseotion, partly in elevation, taken on line 3 3 of Fig. 2. Fig. 4is a transverse section taken on line 4 4 of Fig. 2,the rivets beingshown in elevation. Fig. 5 is a detail rear elevation of the extensibleplate. Y

Like numerals refer to like parts throughout the several views of thedrawings.

In the drawings, 6 is an upper leg-section, and 7 a lower leg-section.The upper legsection 6 is provided with side braces 8 8, pivoted at 9 toside braces 10 10, fast to the lower leg-section 7. The side braces 1010 are each provid ed witha slot 11 and have fas- Serial No. 166L664.(No model.)

the slip-socket 15 are all old-'and well known to those skilled in thisart; but the manner-in which the elastic baud 12 is connected to theslip-socket by means of `an extensible plate 14 constitutes the novelportion of my-invention. The plate 14 is made'in two parts, an upperpart 17 anda lower part 18, joined together by aclamp-plate 19. Theclamp-plate 19 is rigidly fastened tothelower part 18 by a screw 20,which may have screw-threaded engagement with any one of the holes 2l 2121, provided in the lower ,parta 18. The upper end ofthe clamp-plate 19is constructed with a tongue 22, which projects through a slot 23,provided in the upper part 17, and which also projects through one ofthe slots 24 24 24, provided in the lower part 18. It will be seen thatby screwing the clamp-plate to the lower plate 18,with the tongue 22projecting through the slots 23 and 24, the twol parts 17 and 18' willbe joined together in a very rigid and strong manner and Vthat bychanging the screw 20 to different holes 21 and the tongue l 2,2 toproject throughv different slots 24 the length ofthe plate or thedistance between the extreme ends of the upper and lower parts of I lHaving thus described my invention, what- I claim, and desire byLettersPatent to secure, is-.

1. An artificial leg comprising in its construction a leg-section, aslip-socket, and an adjustable elastic connection, consisting of anelastic band and an extensible plate, said band and plate fast, one tothe leg and the other tothe socket.

2. An artificial Vleg comprising in its construction a leg-section, aslip-socket, an elastic band fast to said leg-section, an extensi- IOOble plate madein two parts, one of said parts In testimony whereof Ihave hereunto set fast to said elastic band, the other to said my handin presence of two subscribing witslip-socket, and a clamp-plateconnecting nesses.

said parts together, said clamp-plate fast to JAMES JOHNSTON. 5 vone ofsaid parte and having a tongue con- Witnesses:

strueted to project through a slot in each of CHARLES S. GOODING,

the other of said parts. ANNIE J DAILEY.

